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About P. syringae pv phaseolicola 1448A


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whole plant infection infected bean pods infected leaves infection process
Infection of bean with P. syringae pv phaseolicola (photos by Tom Zitter)

Additional information about the symptoms, disease cycle and control of P. syringae pv phaseolicola can be found at the following sites:

CU Vegetable MD Online - Bacterial Blights of Beans
UCONN IPM - Bacterial Bean Blights
UC IPM - Dry Beans Halo Blight

Strains of P. syringae are noted for their diverse and host-specific interactions with plants (1,2). Specific strains are assigned to one of the over 40 known pathovars, based on their ability infect different plant species. They are then further assigned to a race based on differential interactions among cultivars of the host.

P. syringae pv. phaseolicola strain 1448A

  • cause of halo blight on bean
  • Race 6 (1448A) originally isolated in 1985 from P. vulgaris in Ethiopia
  • spontaneous rifampicin resistant mutant isolated for this work (3)
  • assigned as race 6, virulent on all varieties of Phaseolus vulgaris tested (4)
  • has been used as a recipient strain in searches for avirulence genes in other races (5)
  • contains a non-functional homologue of avrPphE, but lacks sequences hybridising to avrPphB and avrPphF (6)
  • closely related to P syringae pvs glycinea and savastanoi (7)

Literature cited:

1. Hirano, S. S., and C. D. Upper. 2000. Bacteria in the leaf ecosystem with emphasis on Pseudomonas syringae-a pathogen, ice nucleus, and epiphyte. Microbiol. Mol. Biol. Rev. 64:624-653.

2. Rudolph, K., T. J. Burr, J. W. Mansfield, D. Stead, A. Vivian, and J. von Kietzell. 1997. Pseudomonas syringae Pathovars and Related Pathogens. Kluwer, Dordrecht.

3. Fillingham, A. J., Wood, J., Bevan, J. R., Crute, I. R., Mansfield, J. W., Taylor, J. D., and Vivian, A. (1992). Avirulence genes from Pseudomonas syringae pathovars phaseolicola and pisi confer specificity toward both host and non-host species. Physiol. Mol. Plant Pathol. 40:1-15.

4. Taylor, J.D., Teverson, D.M., Allen, D.J. and Pastor-Corrales, M.A. (1996) Identification and origin of races of Pseudomonas syringae pv. phaseolicola from Africa and other bean growing areas. Plant Pathol. 45, 469-478.

5. Tsiamis, G., Mansfield, J.W., Hockenhull, R., Jackson, R.W., Sesma, A., Athanassopoulos, E., Bennett, M.A., Stevens, C., Vivian, A., Taylor, J.D. and Murillo, J. (2000) Cultivar-specific avirulence and virulence functions assigned to avrPphF in Pseudomonas syringae pv. phaseolicola, the cause of bean halo-blight disease. EMBO J. 19, 1-11.

6. Stevens, C., Bennett, M.A., Athanassopoulos, E., Tsiamis, G., Taylor, J.D. and Mansfield, J.W. (1998) Sequence variations in alleles of the avirulence gene avrPphE.R2 from Pseudomonas syringae pv. phaseolicola lead to loss of recogition of the AvrPphE protein within bean cells and a gain in cultivar-specific virulence. Mol. Microbiol. 29, 165-177.

7. Young, J.M., Saddler, G.S., Takikawa, Y., De Boer, S.H., Vauterin, L., Gardan, L., Gvozdyak, R.I. and Stead, D.E. (1996) Names of plant pathogenic bacteria 1864-1995. Rev Plant Pathol 75, 721-763.